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Excel/breaking down a code

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Question
Jan,
Hello, I have the following in one of my workbooks and was hoping you could break it down for me as to what it is doing step by step. I want to try to use it or part if it in other sheets but can't figure how the functions go together. I need to use arrays to fill in sheets in various ways and hope to learn from current pormulas. Following is the code.
=IF(ISNA(MATCH(IF(OFFSET(Sheet1!A3,0,MATCH($A$1,Sheet1!$B$1:Sheet1!$GQ$1,0))=0,"",OFFSET(Sheet1!A3,0,MATCH($A$1,Sheet1!$B$1:Sheet1!$GQ$1,0))),$J$4:$J$85,0)),IF(AND(ROW(A4)<65,ROW(A4)>24),IF(OFFSET(Sheet1!A3,0,MATCH($A$1,Sheet1!$B$1:Sheet1!$GQ$1,0))=0,"",OFFSET(Sheet1!A3,0,MATCH($A$1,Sheet1!$B$1:Sheet1!$GQ$1,0))),""),IF(AND(MATCH(IF(OFFSET(Sheet1!A3,0,MATCH($A$1,Sheet1!$B$1:Sheet1!$GQ$1,0))=0,"",OFFSET(Sheet1!A3,0,MATCH($A$1,Sheet1!$B$1:Sheet1!$GQ$1,0))),$J$4:$J$85,0)>20,MATCH(IF(OFFSET(Sheet1!A3,0,MATCH($A$1,Sheet1!$B$1:Sheet1!$GQ$1,0))=0,"",OFFSET(Sheet1!A3,0,MATCH($A$1,Sheet1!$B$1:Sheet1!$GQ$1,0))),$J$4:$J$85,0)<63),IF(OFFSET(Sheet1!A3,0,MATCH($A$1,Sheet1!$B$1:Sheet1!$GQ$1,0))=0,"",OFFSET(Sheet1!A3,0,MATCH($A$1,Sheet1!$B$1:Sheet1!$GQ$1,0))),""))
Hope you can do it for me. Thanks in advance either way.
John

Answer
Hi John,

What a beast :-)

It is almost impossible to work out what the formula does without a proper dataset and examples. Can you perhaps put the spreadsheet in question on Skydrive (or dropbox, or whichever online file sharing system you like, but remove sensitive information first!) and share a link to it here?
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Jan Karel Pieterse

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